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How to test PubSub Broadcasts?

/phoenix#testing#phoenix_pubsub
oliverandrich

oliverandrich

How to test PubSub Broadcasts?

Hi,

I am doing my first baby steps with using Phoenix PubSub and added a call to broadcast to the context of my application model. Now I want to extend my test code to check the broadcasting of the message. So far, I found the assert_broadcast helper from Phoenix Channels, but nothing specific to Phoenix PubSub.

How do you test that your code pushes a message to PubSub? I checked various other posts in this forum, but I haven’t found a solution. Or, at least I haven’t understood, that it is the solution.

Best regards,
Oliver

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oliverandrich

oliverandrich

It was easier than I thought. Just discovered assert_receive and refute_received. I just had to call the code to subscribe to the PubSub topic in my testcode.

https://hexdocs.pm/ex_unit/master/ExUnit.Assertions.html#assert_receive/3

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